Widget/Object doubts for a newbie...

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Hi,

I'm reading gtk+-doc and looking at any source code relative to gtk programs (I'm a newbie).
However I don't understand use of these functions:

g_object_add_weak_pointer (G_OBJECT (app->new_profile_dialog), (void**) &app->new_profile_dialog);
g_object_set_data (G_OBJECT (app->new_profile_dialog), "create_button", create_button);
g_object_unref (G_OBJECT (size_group));

Why using g_object_unref to place g_free?
What is usefulness of g_object_set_data and g_object_add_weak_pointer?

Thank you very much
Giulio
 
 
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